Trans Temp Gauge?

I got a trans temp gauge from Bowtie Overdrives but it didn't include any directions.

I'm kinda at a loss here as how to wire it all up.
It has three terminals labled "S" "G" "T", and it has the plug for the light so I know none of the terminals are for the lights.
Anybody have any idea where each of these terminals needs to be wired?
Thanks,
Mike

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